Treatment of Shoulder Instability
What is Shoulder Instability
Shoulder instability is a chronic condition that causes frequent dislocations of the shoulder joint. A dislocation occurs when the end of the humerus (the ball portion) partially or completely dislocates from the glenoid (the socket portion) of the shoulder. A partial dislocation is referred to as a subluxation whereas a complete separation is referred to as a dislocation. The repeated dislocation of the humerus out of its socket is called chronic shoulder instability.
Causes of Shoulder Instability
A tear in the labrum or rotator cuff and ligament tear in the front of the shoulder (a Bankart lesion) may lead to repeated shoulder dislocations.
Indications for Shoulder Stabilization
When conservative treatment options such as medications, rest, and ice application fail to relieve shoulder instability, your surgeon may recommend shoulder stabilization surgery.
Shoulder Stabilization Procedure
Shoulder stabilization surgery is done to improve stability and function to the shoulder joint and prevent recurrent dislocations. It can be performed arthroscopically, depending on your particular condition, with much smaller incisions. Arthroscopic stabilization is a surgical procedure to treat chronic instability of the shoulder joint.
Arthroscopy is a minimally invasive surgery and is performed through two tiny incisions (portals), about half-inch in length made around the joint area. Through one of the incisions, an arthroscope (small fiber-optic viewing instrument) is passed. A television camera attached to the arthroscope displays the images of the inside of the joint on the television monitor, which allows your surgeon to look at the cartilage, ligaments and the rotator cuff while performing the procedure. A sterile saline solution is pumped into the joint which expands it and gives a clearer view to the surgeon. Bone spurs, defects or tissue tears will be identified.
Your surgeon makes use of tiny surgical instruments which are passed through the other incisions to treat the condition. Any tear in the rotator cuff will be sutured or stapled. The sutures will be held in place with help of a small anchor which is drilled into the upper part of the humerus. Further, a thermal shrinkage device may be used in order to make the ligaments tight and prevent instability.
Postoperative Care for Shoulder Stabilization
Following the procedure, your surgeon may advise the use of a continuous passive motion machine to prevent stiffness and improve range of motion of the shoulder joint. Pain medications will be prescribed to keep you comfortable. A shoulder sling can be worn for 4-6 weeks to immobilize and facilitate healing. Postoperative rehabilitation program including strengthening exercises will be advised for 6-9 months. You will be able to participate in sports in about 18 to 36 weeks after the surgery.
Advantages of Shoulder Stabilization
The major benefits of arthroscopic stabilization as compared to open repair of instability are that it gives a chance to identify and treat coexisting diseases, lesser pain and complications, combined with shorter hospital stay.
Risks and Complications of Shoulder Stabilization
As with any surgical procedure, there may be certain risks and complications involved and include infection of the surgical wound, post-operative stiffness, risk of arthritis, muscle weakness and injury to the nerves and blood vessels.
Rotator Cuff Tear Symptoms
The rotator cuff is made up of four muscles (subscapularis, supraspinatus, infraspinatus, and teres minor). The rotator cuff surrounds the ball and socket joint (glenohumeral joint) and provides stability to the joint as well as movement. Because the shoulder is a shallow joint and the most mobile joint in the body, it requires the rotator cuff for stability. If let untreated tears can lead to arthritis of the shoulder (rotator cuff arthropathy). This doesn’t mean that good function can’t be maintained with a tear. In fact, many people are able to maintain function despite a tear because the shoulder remains balanced with the remaining rotator cuff and other muscles that control shoulder movement.
Muscle inserts into bone via tendon. In the vast majority of cases, when a tear occurs the tendon pulls away from the bone. Broadly speaking, tears are classified as partial or full-thickness. Partial tears go part way through the tendon while full-thickness tears represent complete detachment. Frequently, an MRI will report “partial-tearing.” Since most people over the age of 40 to 50 have some changes within the rotator cuff, partial tears usually not a problem. The distinction with partial tears is when the tears are considered “high-grade,” meaning that they go almost all the way through the tendon.
Rotator cuff tears may occur after an injury or repetitive activity over time, but most cases occur without an injury. As we age the rotator cuff tendon degenerates and age and genetics are the greatest risk factors for a tear. Studies show that about 50% of people over the age of 65 have a full-thickness rotator cuff tears. Most of these people don’t even know they have a tear!
Treatment for rotator cuff tears is based on age, health, and response to conservative treatment. The rotator cuff tendon is not capable of repairing itself. Rather then tear will stay the same size or enlarge over time. In people under the age of 60, the risk of progression is about 50% in a two-year period. The ability to get healing with a surgical repair depends upon age, the tear size, muscle atrophy, associated arthritis, and health (smoking and diabetes for instance). One must also consider timing of repair. Traumatic tears have a better outcome if fixed within 6 months of injury. Additionally, after about six months of symptoms atrophy may occur. Unfortunately, atrophy of the rotator cuff is not considered reversible. Based on this, if someone desires repair, I typically recommend performing this within six months of beginning treatment.
Guidelines for surgery are general and must be individualized as noted above. But, as a general guideline, I recommend repair for all full-thickness tears in people under the age of 60 given the risk of increase in tear size. For people between the ages of 60 and 70, treatment is based on the above factors with health and activity expectations being the most important factors. For people over the age of 70, I nearly always recommend an attempt at conservative treatment. Surgery is then considered if one does not respond to conservative treatment.
For partial tears, conservative treatment should almost always be attempted first since these tears progress slowly or may not progress at all. Then surgery is considered if one does not respond to 4 to 6 months of conservative treatment.
Treatment options include:
Anti-inflammatories such as ibuprofen (Motrin or Advil) and naproxen (Aleve) are used to reduce pain and inflammation. The max does for ibuprofen is 800 mg three times per day. The max does for naproxen is 500 mg twice daily. Prolonged usage should be avoided and these should be taken with food since they can affect the stomach lining. If one experiences an upset stomach these should be stopped.
Injection of a steroid (cortisone) may be used to provide pain relief and facilitate physical therapy. I perform these injections with an ultrasound machine. This allows direct visualization of the joint and improved accuracy of the injection. Up to 3 injections over a 2 year period are allowed. Beyond this there are typically diminishing returns and excessive injections may be detrimental to the rotator cuff.
Alternative injections include Toradol (an anti-inflammatory agent similar to ibuprofen), prolotherapy, or platlet-rich plasma (PRP). ). I use Toradol in people who do not tolerate steroids. Prolotherapy involves injecting a substance such as sugar into tissue to “stimulate a healing response.” I do not perform prolotherapy as it has not been shown to improve symptoms in rotator cuff tears. PRP involves taking a small amount of blood from a patient, spinning in a centrifuge to separate the growth factors from the red blood cells, and then injecting the growth factors back into the shoulder to potentially decrease pain. While PRP has anti-inflammatory properties, it has not been shown to heal the rotator cuff. Therefore, it is not covered by insurance and is an out-of-pocket expense. Typically a series of 3 injections are performed at weekly intervals for 3 weeks.
Physical therapy with strengthening is one of the mainstays of treatment of rotator cuff tears. Long-term studies show that despite not healing the rotator cuff, therapy can lead to substantial improvements in function with good patient satisfaction. The core exercises in strengthening the rotator cuff are provided at the end of this handout. These exercises can be performed twice per day, 5 days a week.
Most tears, regardless of size can be repaired. I perform all my rotator cuff repairs arthroscopically. This is less invasive and therefore less painful than an open incision. It also allows a better view of the rotator cuff. This procedure requires general anesthesia, takes about 60 to 90 minutes to perform, and patients go home the same day. Small incisions are made in the shoulder, a scope is inserted, and the rotator cuff is repaired with anchors. Anchors are essentially headless screws which are placed flush with the bone. These anchors have sutures that are used to bring the tendon done to the bone so that the tendon can heal to the bone. The long-term outcome of this procedure is very good (>90% success in most cases) and the risk of complication is very low (1/5000 chance of infection). However, repair requires a long recovery period and the tendon takes about 12 weeks to heal into the bone. Therefore, a sling is worn for 6 weeks after surgery. Specific motion exercises afterwards are tailored to the tear pattern (patient-specific). The sling is removed at 6 weeks and motion is progressed. Strengthening is allowed at 12 weeks, followed by gym activities at 4 months. Full recovery takes 6 months for small tears and 12 months for large or massive tears.